Electrophoresis Display Driving Electrode Touch Detection
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Solution Overview
Problem
Conventional display apparatuses with electrophoresis layers face challenges in improving touch detection response performance due to the need for separate electrodes for image display and input position detection, and they have slower display-rewriting speeds and higher touch detection frequency ratios compared to liquid crystal displays.
Innovation Solution
A display apparatus design where the driving electrode for image display is also used for touch detection by alternating between display and detection processes, with a method of dividing the display region into more partial display regions than detection regions and using a touch detection unit to detect input positions based on electrostatic capacitance, allowing for simultaneous image display and touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate electrodes are provided for touch detection on the display surface side, then touch detection function is achieved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The driving electrode is designed to serve dual purposes: displaying images through electrophoresis and detecting touch inputs through electrostatic capacitance. By making the driving electrode universal for both functions, the patent eliminates the need for separate touch detection electrodes, thereby reducing device complexity while maintaining both display and touch detection capabilities
2Speed
If touch detection frequency is increased to improve response performance, then touch detection response is improved, but display rewriting speed becomes relatively slower
Solution Approach 1:
The patent implements periodic alternating between display mode and touch detection mode. The driving electrode is selectively activated for either image display or touch capacitance detection in a time-division manner. This periodic switching allows the system to achieve high touch detection response speed without permanently sacrificing display rewriting speed, as the display function is restored in alternating periods
3Device complexity
If driving electrode is used for both display and touch detection, then device complexity is reduced, but electrical signal interference may occur
Solution Approach 1:
The patent uses periodic time-division multiplexing to alternate between display signal application and touch detection signal application on the same driving electrode. By ensuring that display and touch detection operations do not occur simultaneously on the same electrode, the system prevents electrical signal interference while maintaining the multi-functional capability of the electrode structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the response performance of touch detection while maintaining image display capabilities, even with a higher touch detection frequency relative to display rewriting speed, similar to liquid crystal displays.
Implementation Method 1
an electric field is formed in the electrophoresis layer by, for example, applying a voltage between a pixel electrode formed on each pixel and a driving electrode commonly formed for a plurality of pixels in each of the plurality of the pixels. At this time, the electrophoretic particles functioning as the charged particles are moved in the direction of the electric field or in the direction opposite to the direction of the electric field
Implementation Method 2
when an inputting operation is performed by making the input tool such as a finger, a touch pen or others contact with the capacitive element, a capacitance is added to the capacitive element so as to change the detection capacitance, so that the input position is detected by utilizing the manner
Implementation Method 3
In the first driving process, the first driving unit forms an electric field between the second electrode disposed in the selected first partial region and the first electrode of the plurality of the first electrodes which is disposed in the selected first partial region, so that an image is displayed in the selected first partial region
Data Source
AI summary
In a display apparatus provided with an electrophoresis layer, such a display apparatus as to improve the response performance of a touch detection is provided. A driving unit included in a display apparatus alternately repeats a display driving process for supplying a first driving signal to a driving electrode disposed in a selected partial display region and a detection driving process for supplying a second driving signal to a driving electrode disposed in another selected partial display region while successively cyclically changing the partial display region and successively cyclically changing another partial detection region. Moreover, in the detection driving process, a touch detection unit included in the display apparatus detects an input position at another selected partial detection region based on an electrostatic capacitance of the driving electrode disposed at another selected detection region.